Rivet heater



RIVET HEATER 7 Filed June 1921 2 Shaw-Sheet 1 W is 5M4,

W. E. IRISH RIVET HEATER 2 Shoets=$heet 2 Fey; 2,

#1442717 0/? m6 ma 57 473% Filed June 1921 Aug. 30,1927.-

EA-a Z Patented Aug. 30, 1927.

'UNITED STATES PATENT OFFICE.

WILLIAM E. IRISH, 0F CLEVELAND, OHIO, ASSIGNOR TO THE HYDRAULIC STEEL COM- PANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

RIVET HEATER.

Application filed June 2, 1921. Serial No. 474,404.

This invention relates to electric rivet heaters of the type in which rivets are clamped between a pair of electrodes and heated by the passage of an electric current. i v

The object of this invention is to provide a machine capable of bringing rivets successively into position between the electrodes of the heater.

In the drawing forming a part of this specification,

Figure l is a vertical section showing parts of the mechanism in elevation.

Fig. 2 is a detail view showing the rivet feeder in side elevation.

Fig. 3 is a top plan view of the feeder.

The rivet heater which is of an old and well known type is mounted upon a carriage 1 and comprises an upper stationary clamping electrode 2 and a lower movable clamping electrode 3, together with suitable electrical connections for supplying electric current thereto. A vertical bar 4 is connected at its upper end to the movable electrode 3 and at its lower end to a treadle lever 5 to which is attached a treadle 6. Interposed between a bracket 7 on the carriage and a collar 8 on the rod is a compression spring 9 which normally holds the treadle 6 in elevated position and the electrode 3 in clamping position. I

Rotatably mounted in upper and lower adjustable bearing brackets 10 and 11 is a vertical shaft 12. Above the upper hearing 10, shaft 12 has keyed thereto a collar 13 to which are attached pawls 14. Mounted for free rotation on the shaft above the collar 13 is a disk 15 carrying on its under side a ratchet 16 engaging with the pawl 14 on the collar 13.

The electrodes 2 and 3 are positioned respectively above and below a portion of the periphery of the disk 15, and the disk 15 has peripheral notches 17 of a width to receive the bodies of the rivets and to permit them to hang therein by their heads. Ri idly connected to the bar 4 and suitably insu ated therefrom is a bracket 18 carrying a collar,

19 slidably engaging the shaft 12. The collar 19 has a cam slot 20 therein into which projects a pin 21 rigidly secured to the shaft 12 In the operation of the machine the operator places a suitable number of cold rivet-s in the notches 17 on the entering side. To bring a rivet into heating position, the operator steps on the treadle 6, moving the bar 4, collar 19 and electrode 3 downwardly. Downward movement of the collar 19 causes cam slot 20 to shift the pin 21 laterally and impart a partial revolution to the shaft 12 in the direction of rotation of the disk, pawls 14 carrying the disk with the shaft. The cam slot 20 is designed to impart an angular movement to the shaft correspond ing to the angular distance between adjacent notches 17, and the teeth of the ratchet 16 also correspond with the notches 1'7 so that the movement is just sufficient to move one notch out from between the electrodes and another notch into register therewith.

Downward movement of the electrode 3 brings it clear of the lower end of the incoming rivet to permit it to enter freely between the two electrodes. When the operator releases the treadle 6 the spring 9 returns the electrode 3 to clamping position, raising the rivet up against the stationary electrode 2 as shown in Fig. 2. Upward movement of the collar 19 turns the shaft 12 back to original position, the pawls 14 riding back the inclined faces of the ratchet teeth and dropping into adjacent notches.

When the first rivet has been heated sufficiently, the operator again steps on treadle 6 whereupon the above described operation is repeated, the heated rivet being carried out from between the electrodes and a cold rivet positioned between them. The heated rivets may be taken from the notches 17 as desired for use.

The disk 15 is preferably made of heat resisting and insulating material such as asbestos board to prevent too rapid cooling of the rivets.

Having described my invention, what I claim is i movable toward and from the other, a

treadle connected to said movable electrode and a rivet feeder operably connected to said treadle.

T In testimony whereof, I hereunto aflix my sign ature.

WILLIAM E. IRISH. 

